public class Computer {
    public void powerOn(){
        System.out.println("打开笔记本电脑");
    }
    public void powerOff(){
        System.out.println("关闭笔记本电脑");
    }
    public void uesDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse=(Mouse) usb;
            mouse.click();
        }
        else if(usb instanceof keyBoard){
            keyBoard keyBoard=(keyBoard) usb;
            keyBoard.input();
        }
        usb.closeDvice();
    }

    public static void main(String[] args) {
        Computer computer=new Computer();
        computer.powerOn();
        computer.uesDevice(new Mouse());
        computer.uesDevice(new keyBoard());
        computer.powerOff();
    }
}

